A little sun exposure is important for the production of certain vitamins, such as vitamin D. But too much of a good thing can be harmful. Your baby's skin is much thinner than yours and is much more prone to burning and cancer formation. Therefore, protect the skin from excessive sun exposure and use the maximum sun protector available for your child (not before 6 months of age since they absorb too many chemicals from the skin this early). Remember to apply lotions sparingly on the face as the skin may absorb more of the chemicals in the lotion from there. Keep the face protected with a hat or other article of clothing. Also remember that a baby may look into the sunlight and damage their eyes, so keep their eyes out of the direct sunlight.
All it takes is one blistery burn to cause skin cancer!